When Mr Johnson was over 50 but less than 80 he told a friend: "Each of my sons has as many sons as brothers, and the number of my years is exactly that of the number of both my sons and grandsons." How many sons and grandsons had
Mr Johnson?

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is this harder than i think? or am i making a mistake?

I think it's pretty hard :D

i am thinking you can guess and check for this one

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